There are all sorts of cool things you can do with SimplePie and feeds. These are some of the most popular code snippets and samples we've come across. Feel free to add your own, but if there's a similar one to what you're wanting to post, please see if you can merge your notes into the one that already exists.

Screencasts are either QuickTime 7 files (compressed as H.264/AAC) or are Flash Video (.flv), and may be wider than a 1024×768 screen resolution. Assumes that you have gotten through the Introduction to PHP tutorial (as noted in the minimum requirements), and understand that a feed has information associated with it, and a feed contains one or more items which also have information associated with them.

Introduction to SimplePie (10:56)
This screencast by Ryan Parman discusses the creation of a simple page, feed auto-discovery, mashing and sorting multiple feeds by time and date, favicons, and PHP5 method chaining.

Creating the Digg SimplePie Add-on (22:13)
This screencast by Ryan Parman discusses the creation of SimplePie Add-ons including extending and overriding the built-in SimplePie classes. Uses Digg's custom RSS tags as the application of this Add-on.

CSS-Tricks: Adding RSS content with SimplePie (33:03)
In this screencast by Chris Coyier, we build a really simple site that grabs content from multiple RSS feeds, smushes them together, and displays them using our own custom markup.